{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["cell type", "protein", "cell line", "DNA", "RNA"], "input": "The activity of dihydropyrimidine dehydrogenase ( DPD ), the initial enzyme of pyrimidine (and FUra ) catabolism , in peripheral blood mononuclear cells was measured in each subject by a specific radiometric assay using FUra as the substrate."}
{"cell type": ["peripheral blood mononuclear cells"], "protein": ["dihydropyrimidine dehydrogenase", "DPD", "enzyme"], "cell line": [], "DNA": [], "RNA": []}